| 阚晓婧,罗天友,吕发金,李咏梅,方维东,肖智博,张志伟,陆云峰.智能追踪技术触发阈值对肾动脉CT血管成像的影响[J].中国医学影像技术,2008,24(5):721~724 |
| 智能追踪技术触发阈值对肾动脉CT血管成像的影响 |
| Volume CT angiography of the renal arteries: the effect of different threshold of triggered angiographic acquisition based on a bolus-tracking technique |
| 投稿时间：2007-12-26 修订日期：2008-03-07 |
| DOI： |
| 中文关键词: 肾动脉 体层摄影术,X线计算机 智能追踪技术 |
| 英文关键词:Renal artery Tomography, X-ray computed Monitored-triggered technique |
| 基金项目: |
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| 中文摘要: |
| 目的 探讨智能追踪技术中触发阈值对肾动脉CT血管造影图像质量及其分支显示的影响。 方法 105例患者随机分组,分别按触发阈值140~150 HU(A)、150~160 HU(B)、160~170 HU(C)、170~180 HU(D)、180~190 HU(E)、190~200 HU(F)、200~210 HU(G)启动扫描,采用GE公司64层容积CT、按3 ml/s的流率团注碘海醇300(300 mgI/ml),其他扫描参数相同,数据传至工作站并重建。由2名经验丰富的影像医师对MIP图像记录和评分。所有数据资料均采用SPSS 11.5软件统计分析。 结果 ①图像质量:以D组和E组评分最高。②肾动脉分支的显示:以E组和F组肾动脉主干显示最佳;D组、E组和F组肾动脉主干和一级分支显示最佳:各组对二级、三级分支显示均不佳。 结论 Smart Prep技术中不同触发阈值对肾动脉CTA扫描质量有显著影响,触发阈值为170~190 HU时图像质量最好、各级分支显示最佳。 |
| 英文摘要: |
| Objective To investigate the image quality and vessel depiction of renal CTA with threshold of triggered angiographic acquisition based on bolus-tracking technique of 140—150 HU, 150—160 HU, 160—170 HU, 170—180 HU, 180—190 HU, 190—200 HU, 200—210 HU. Methods In this prospective study, 105 patients were divided randomly into A—G 7 groups: 140—150 HU (A), 150—160 HU (B), 160—170 HU (C), 170—180 HU (D), 180—190 HU (E), 190—200 HU (F), 200—210 HU (G). All parameters other than threshold were kept constant. Then, all data were sent to work station, and three dimensional reconstruction of CTA was performed. All images were rated by two radiogists in terms of image quality and the quality of vessel depiction for the proximal, segmental,and subsegmental renal artery. The statistical software of SPSS 11.5 was used for analyzing the results. Results ①Image quality: group D and E had highest score. ②Vessel depiction: main renal arteries were imaged best in group E and F; first-order branches were imaged best in group D, E and F (means of ridit values were 0.6336, 0.6501 and 0.6362 respectively); second-order and third-order branches were not imaged well in any groups with no significant difference found among groups. Conclusion The threshold of triggered angiographic acquisition based on a bolus-tracking technique affects images’quality obviously. Image quality and vessel depiction of renal CTA were best performed with a threshold of 170—190 HU;main renal arteries and their first-order branches were best performed with a threshold of 170—200 HU. |
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